An analysis of risk factors associated with infection status across the dry periodTools Henderson, Andrew C. (2020) An analysis of risk factors associated with infection status across the dry period. MVM thesis, University of Nottingham.
AbstractThe dry period is very important for mammary gland health, with the aim not only to cure existing intra-mammary infections (IMI) but also to prevent new IMI. Although it is known that the dry period is an important time for optimising udder health, the probability that individual cows will succumb to a new IMI, or if infected, will fail to cure an IMI is not well established. The aim of this study was to investigate whether lifetime cow data, available through routine on-farm milk recording, could be used to predict changes in IMI status across the dry period for individual cows that were i) deemed high somatic cell count (SCC) ( > 199,000 cells/ml) or ii) low SCC ( < 200,000 cells/ml) at the last test day prior to drying off. Milk recording data collected between September 1994 and July 2014 from 114 herds in Great Britain were used. Two 2 level random effects models were built and both cure and new IMI were used as outcome variables in separate models.
Actions (Archive Staff Only)
|